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With the rapid development of economy and the continuous improvement of the production value of industrial enterprises, as well as the rapid progress of urbanization, the discharge and treatment volume of industrial wastewater and urban sewage are also increasing day by day. Sludge treatment and disposal has become a bottleneck problem restricting the development of sewage treatment industry.
According to the Technical Guide for sludge treatment and disposal, four disposal methods of sludge are proposed: land use, sanitary landfill, building materials utilization, and dry incineration. Sludge drying incineration has become one of the most important and ideal technical disposal schemes at this stage.
A thin film dryer is composed of a cylindrical shell with a heating layer, a rotating rotor, and a driving device. The rotor is equipped with paddles of different shapes that can be flexibly adjusted to adapt to various sludge characteristics.
The wet sludge forms a thin layer on the hot wall. The residence time is approximately 10-15 minutes, allowing for fast start, stop, and emptying operations.
The moisture content is reduced from 80% to approximately 35%. Carrier gases (water vapor, dust, and odor) are discharged into a condenser. The system operates under micro-negative pressure to prevent odor and dust leakage.
The thin film dryer body features a net weight of 33,000 kg and horizontal layout. It utilizes a steam heat source (1.0MPa, 180°C) for indirect heating.
During commissioning, the system reached 87.5% of the designed dry base treatment scale. The unit heat consumption is approximately 504 kcal/kg of evaporated water, proving the system's efficiency.
This technology is suitable for both hazardous waste sludge in petroleum/chemical industries and municipal sludge treatment, achieving maximum reduction and stable operation.
